gfx: Converge scale precision related differences to single class.

ui/gfx/gfx_tests.gyp

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 37 matching lines @@
         'font_render_params_linux_unittest.cc',
         'geometry/box_unittest.cc',
         'geometry/cubic_bezier_unittest.cc',
         'geometry/insets_unittest.cc',
         'geometry/matrix3_unittest.cc',
         'geometry/point3_unittest.cc',
         'geometry/point_unittest.cc',
         'geometry/quad_unittest.cc',
         'geometry/rect_unittest.cc',
         'geometry/safe_integer_conversions_unittest.cc',
+        'geometry/scale_unittest.cc',
         'geometry/scroll_offset_unittest.cc',
         'geometry/size_unittest.cc',
         'geometry/vector2d_unittest.cc',
         'geometry/vector3d_unittest.cc',
         'image/image_mac_unittest.mm',
         'image/image_util_unittest.cc',
         'mac/coordinate_conversion_unittest.mm',
         'nine_image_painter_unittest.cc',
         'platform_font_linux_unittest.cc',
         'platform_font_mac_unittest.mm',
@@ skipping 130 matching lines @@
               'dependencies': [
                 '../../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }